Question

Heterozygous tall plants were crossed with dwarf plants. Then the percentage of dwarf plants produced in the next progeny is:

• A. 25
• B. 75
• C. 50
• D. 65

Hint:

Tt × tt results in a 1:1 ratio of tall to dwarf — 50% dwarf progeny.

Answer 1

The Correct Option is C

Let:
- Tall = dominant (T)
- Dwarf = recessive (t)
- Heterozygous tall = Tt
- Dwarf = tt
Cross: \[ Tt \times tt \] Using a Punnett square: \[ \begin{array}{c|c c} & t & t \\ \hline T & Tt & Tt \\ t & tt & tt \\ \end{array} \] Resulting progeny:
- 2 Tt (tall)
- 2 tt (dwarf)
So, 50% of the progeny are dwarf.

Answer 2

Heterozygous tall plants were crossed with dwarf plants. Then the percentage of dwarf plants produced in the next progeny is:

Let’s analyze the genetic cross:

- Tall (T) is dominant over dwarf (t).
- Heterozygous tall plants have the genotype Tt.
- Dwarf plants have the genotype tt.

Cross: Tt (heterozygous tall) × tt (dwarf)

Possible gametes:
- From Tt: T or t
- From tt: t only

Punnett square:
- T × t = Tt (tall)
- t × t = tt (dwarf)

So, the progeny genotypes:
- 50% Tt (tall)
- 50% tt (dwarf)

Therefore, the percentage of dwarf plants in the progeny is 50%.

Correct Answer: 50